Relative importance of fluvial input and wave energy in controlling the timescale for distributary-channel avulsion

Details Relative importance of fluvial input and wave energy in controlling the timescale for distributary-channel avulsion Relative importance of fluvial input and wave energy in controlling the timescale for distributary-channel avulsion

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3223404s&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 23, CiteID L23404

Physics

Geophysics

10

Hydrology: Geomorphology: Fluvial (1625), Hydrology: Sediment Transport (4558), Marine Geology And Geophysics: Littoral Processes, Marine Geology And Geophysics: Marine Sediments: Processes And Transport

Scientific paper

Existing avulsion models are decoupled from nearshore processes. Here, I explore quantitatively how the interplay of wave energy with fluvial input of sediment and water controls the aggradation rate and avulsion timescale of a single distributary channel. My approach rigorously couples a diffusive, moving-boundary theory of fluvial morphodynamics with a diffusive treatment of shoreface morphodynamics. I use this deterministic model to quantify the time required for channel-belt superelevation, normalized with channel depth, to attain a threshold value for nodal avulsion at a specified channel location. Increasing the long-term wave energy relative to fluvial input by an order of magnitude increases longshore sediment dispersal, thereby reducing the rate of channel-belt aggradation and associated seaward extension and increasing the avulsion timescale by a factor of approximately 50. Far-field processes eventually limit the ability of wave energy to suppress avulsion.

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